US20030154585A1 - Mechanical cone scarfing deburrer to remove oxygen cutting burrs and cutting beads after thermo-chemical cross-cutting or slitting steel workpieces such as slabs, blooms and billets - Google Patents

Mechanical cone scarfing deburrer to remove oxygen cutting burrs and cutting beads after thermo-chemical cross-cutting or slitting steel workpieces such as slabs, blooms and billets Download PDF

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Publication number
US20030154585A1
US20030154585A1 US10/271,127 US27112702A US2003154585A1 US 20030154585 A1 US20030154585 A1 US 20030154585A1 US 27112702 A US27112702 A US 27112702A US 2003154585 A1 US2003154585 A1 US 2003154585A1
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US
United States
Prior art keywords
deburring
set forth
head
knife
workpiece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/271,127
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English (en)
Inventor
Horst Lotz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alpine Metal Tech North America Inc
Original Assignee
Gega Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gega Corp filed Critical Gega Corp
Assigned to GEGA CORP. reassignment GEGA CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOTZ, HORST K.
Publication of US20030154585A1 publication Critical patent/US20030154585A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/08—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for flash removal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • B22D11/1265—Accessories for subsequent treating or working cast stock in situ for cutting having auxiliary devices for deburring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/14—Scrubbing or peeling ingots or similar workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K7/00—Cutting, scarfing, or desurfacing by applying flames
    • B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5182—Flash remover
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/3042—Means to remove scale or raised surface imperfection
    • Y10T409/304256—Means to remove flash or burr

Definitions

  • the present invention relates generally to deburring equipment.
  • the workpieces are positioned in a stationary manner with the front or the rear cutting burr above the deburrer and are deburred when the roller table, the driving pulley or the shifting equipment are moved.
  • the workpieces are positioned in a stationary manner with the front or the rear cutting burr above the deburrer and are deburred when the deburrer is shifted or when its drum is rotated against the fixed workpiece.
  • the workpieces are moved on a roller table at operating or conveying speed, the front and the rear oxygen cutting burr are removed from the workpiece when the deburrer passes and is afterwards shifted in opposite direction.
  • the workpieces are moved on a roller table at operating or conveying speed, the front and the rear oxygen cutting burr are knocked off of the workpiece when one of the deburrer rotors passes and is afterwards rotated in opposite direction.
  • the upright or shifting deburrers of the first three systems are equipped with straight, horizontal shear bars or with square or round shear blocks that are arranged next to each other and that can perhaps be lifted and lowered elastically.
  • the deburrers of the second system are equipped along their circumferences with round, if necessary spring borne shear blocks.
  • the heavy drum is hydraulically pushed against the workpiece and is then rotated with an enormous expenditure of force (the burrs are broken).
  • the burrs are only partially turned off or folded up, there are not only high costs but also low deburring rates and big positioning efforts.
  • the deburrers of the fourth system are equipped with small hinged hammers along their circumference and over the entire length of the rotor. These hammers are lifted up by the centrifugal force when the rotor turns at high speed, thus removing the oxygen cutting burr passing above by knocking it into many little pieces.
  • the high speed required also produces great centrifugal forces entailing the danger of residual burr being hurled round making expensive protection equipment necessary.
  • the expenditures for maintenance and spare parts are very extensive, and the deburring rates also leave much to be desired.
  • a so far successful, but from the above-mentioned systems differing design is a deburring machine that travels longitudinally to the oxygen cutting burr at rate of advance.
  • This machine presses a plate-type shearing tool on a lever from below against the bottom face of the workpiece and shears or knocks off the cutting burr while this lever oscillates to and fro.
  • This design which is mostly applied to deburr resting workpieces, results in a limited production due to the limited size of the shearing tool and is applicable only under certain restricting circumstances, such as an enormous amount of time, extensive space requirements and especially high costs of installation.
  • the main disadvantage of this deburrer is its restricted or awkward and involved application on permanently moving workpieces, its many moving parts and the at times marginal deburring rate (below 99%), i.e., after the deburring process there are still remains of cutting oxygen burrs on the workpiece, or the burrs are merely folded up.
  • a tiltable deburrer with a continuous and straight shear bar in the front and at the back is the simplest and most economical design of a deburrer. Although one shear bar is well pressed underneath the bottom face of the workpiece each time the deburrer is tilted, the bad deburring rates in case of an inclined, convex or concave bottom face and the unavoidable travel to and fro are the unforgivably great disadvantages of this type of deburrer despite the deburring forces being kept at a minimum owing to an inclined, evenly and increasingly gripping shear bar thus keeping the noise level during operation very low.
  • Much quieter and safer is a deburrer that operates at a lower rate, for example at roller table speed.
  • This takes a beam-shaped piston body that is positioned under the workpiece and that is equipped with compressed air operated deburrer pistons. After it is pressed against the bottom face, this piston body is moved countercurrent to the resting or only slowly moving cutting burr.
  • the workpiece with the oxygen cutting burr can also be moved towards the stationary deburrer and that twice per workpiece, once towards each end of the workpiece and beyond.
  • This design has also the disadvantage of oxygen cutting burrs or parts of it being merely folded up.
  • An aspect of the present invention is to provide a deburring apparatus for removing at least one of a burr and a bead from a workpiece, in which the general nature of the deburring apparatus can be stated as including a drive unit, a deburring head being disposed on the drive unit and being rotatable by the drive unit about an axis, at least a first knife mounted on the hub, and at least a portion of the at least first knife being substantially spiral-shaped.
  • An aspect of the present invention is to provide a deburring apparatus for removing at least one of a burr and a bead from a workpiece, in which the general nature of the deburring apparatus can be stated as including a drive unit including a biasing system, a deburring head disposed on the drive unit and being rotatably driveable by the drive unit about an axis, at least a portion of the deburring head being generally conic, at least a first knife, the least a first knife being fixedly mounted on the hub, and the deburring head being translatable along the axis and being biased toward the workpiece by the biasing system.
  • FIG. 1 is a front elevational view, partially cut away, of a first embodiment of the present invention mounted on a foundation and engaging a deburring surface of a workpiece;
  • FIG. 2 is a perspective view of a portion of the first embodiment
  • FIG. 3 is a front elevational view, partially cut away, of a second embodiment of the present invention mounted on a foundation and engaging a deburring surface of a workpiece;
  • FIG. 4 is a perspective view of a portion of the second embodiment.
  • an aspect of the present invention is to provide a mechanical cone scarfing deburrer to remove oxygen cutting burrs and cutting beads after thermo-chemical cross-cutting or slitting of steel workpieces such as slabs, blooms and billets in hot and cold condition either stationary or moving on a roller table.
  • the deburrer includes a cone stub drum that may include cone stub segments.
  • the deburrer is oriented at an angle of 45° to 75° with respect to a surface line of the workpiece, and may include a portion that is substantially level or parallel with the respective surface line of the workpiece and may be positioned horizontally under the slit or cross-cut workpiece.
  • the deburrer may also include on the surfaces one or more scarfing knives arranged spirally at an angle of 0° to 45° to the cone centre axis.
  • a hub of the cone stub and of any segment spokes is movable on a shaft (this shaft correspondingly being arranged at an angle of 45° to 75° to the horizontal,) and may be movable in a spring type manner by means of compressed air, hydraulics or a coil spring.
  • This shaft, resistant to bending, may be designed as a spline shaft stub that may be held in a pair of bearings for slitting and cross-cutting forces inside a deburrer housing and that may be motor-driven or turned by a hydraulic drive.
  • the size, quantity and arrangement of the spiral scarfing knives on the surface shell of the cone stub or of its corresponding segment spokes may be chosen such that the workpiece, while it is passing through, does not touch the surface of the cone stub shell or the scarfing knives in a position—the centre of a region between the scarfing knives under the bottom face of the workpiece (FIGS. 2 and 4)—even when the surface slightly lowers.
  • the height of the hub of the cone stub may be adjustable by means of a coil spring, compressed air, hydraulics or a mechanically adjustable support. If compressed air is applied the adjustment is to be carried out using an upper and a lower stop.
  • the shell upper line of the cone stub which is equipped with scarfing knives, is parallel or almost parallel or positioned at a small angle with respect to the oxygen cutting burr, whereby this line may be pointing slightly at an angle extending underneath the workpiece.
  • the deburrer accordingly may be positioned on the tilted axle in a manner enabling it to tilt upwards at the start of the deburring process.
  • the deburrer housing which holds the drive, the pair of bearings, the shaft and the deburrer cone with hub and scarfing knives, may be equipped with a simple substructure housing that is firmly anchored in a foundation. Owing to this substructure housing and by means of adjusting bolts, the position of the housing may be adjusted regarding its height and in longitudinal and crosswise direction. An axle with bearings and a spring borne element are arranged between the substructure housing and the deburrer housing so that the cone scarfing deburrer can adapt to the bottom face of the workpiece even in case of twisted cross cuts within the deburring area.
  • the design of a cone scarfing deburrer ( 1 ) as depicted in FIGS. 1 and 2, described in the following and claimed as novelty worthy of protection, is basically characterized by a design and an operation that correspond to that of a scarfing deburrer or a scarfing deburring process respectively. That means that an oxygen cutting burr ( 2 ) or cutting bead ( 2 a ) is removed from a workpiece ( 3 ) with an—over the entire width of the workpiece—even, steady, rather slow movement of about 3 m/min. to about 150 m/min. above the speed of the burr during workpiece conveyance.
  • the shearing tool used is intended to be as long as a burr; it is a continuous blade, the so-called scarfing knife ( 4 ), although may consist of 20 mm to 100 mm long pieces.
  • This scarfing knife ( 4 ) presses along the workpiece against the oxygen cutting burr ( 2 ) while the knife ( 4 ) is positioned therebelow 5° to 30° to the oxygen cutting burr ( 2 ) and thus therebelow 85° to 60° to the direction of advance of the scarfing knife ( 4 ).
  • the scarfing knife ( 4 )—with a cutting angle working angle of 45° to 90° between the bottom face of the workpiece ( 3 ) and the scarfing knife ( 4 )—is designed as a scarfing knife spiral ( 4 ) or as multiple scarfing knife spirals ( 4 ) with a spiral distance appropriate to grip the burrs.
  • the scarfing knife is a longitudinal spiral with a large diameter and a large inclination on the shell of one cone-shaped deburrer roll ( 1 a ) or on its corresponding deburrer cone spokes ( 1 b ) as depicted in FIG. 3.
  • the cone scarfing deburrer ( 1 ) suggested for that purpose may include the following components with the appertaining functions:
  • the cone stub ( 1 a ) or the cone spokes ( 1 b ) hold a scarfing knife spiral ( 4 ) to remove oxygen cutting burrs ( 2 ) or oxygen cutting beads ( 2 a ) from the workpiece ( 3 ).
  • This scarfing knife spiral ( 4 ) may consist of several 20 mm to 100 mm long scarfing knife parts ( 4 ) that are bent and twisted to suit the spiral design and is installed with its hub ( 5 ) on a shaft ( 6 )—perhaps a spline shaft ( 6 )—in a movable manner.
  • the shaft ( 5 ) is held in a stable pair of bearings ( 7 ) to absorb great longitudinal and shearing forces.
  • a compression spring ( 8 ) is positioned between the hub ( 5 ) and the spline shaft ( 6 ), in order to press the scarfing knives ( 4 ) against the bottom face of the workpiece on the one hand and to yield when the height of the workpiece ( 3 ) is changed on the other hand.
  • the hub ( 5 ) can be used here too as a cylinder and the shaft ( 6 ) as a stationary piston for resilience with compressed air, even for lifting and lowering the cone stub ( 1 a ).
  • An advantage of the cone scarfing deburrer ( 1 ) is that the shaft ( 6 ) is used for the rotary deburring energy as well as for enabling a press-and-shift movement in height.
  • the pair of bearings ( 7 ) is positioned inside a frame ( 9 ) or housing in which the gear ( 10 ) and the motor ( 11 ) can be found as well.
  • This frame ( 9 ) is fixed to a foundation plate or in the foundation by means of adjusting bolts ( 12 ) and nuts and can thus be adjusted in height, laterally, and longitudinally.
  • the drive unit with motor ( 11 ) and gear ( 10 ) is flanged to the inside of the frame ( 9 ) and is connected with the shaft ( 6 ).
  • the cone scarfing deburrer ( 1 ) can also be equipped with deburrer cone spokes ( 1 b ) instead of a deburrer cone stub ( 1 a ).
  • the conical shell ( 1 a ) i.e. the cone roll, is replaced by one, two, three or more cone spokes ( 1 b ) for manufacturing reasons. These are wide enough to hold the scarfing knife spirals ( 4 ). The spokes are held together at the inside by means of the hub ( 5 ).
  • the workpiece ( 3 ) may move—while the cone scarfing deburrer ( 1 ) is in resting position—across a gap or region between the scarfing knives ( 4 ) or between the cone spokes ( 1 b ) to enable free passage of the workpiece ( 3 ) between each of the deburring sequences.
  • the motor ( 11 ) is to be braked in a correspondingly accurate manner after a deburring process has been completed.
  • the direction of rotation of the motor ( 11 ) is to be changed accordingly.
  • the cone scarfing deburrer ( 1 ) is to be positioned just about parallel underneath the longitudinal burr, and to remove oxygen cutting beads ( 2 a ) above the workpiece ( 3 ) on the upper workpiece edge is turned by 180°.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Turning (AREA)
  • Milling, Broaching, Filing, Reaming, And Others (AREA)
  • Milling Processes (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US10/271,127 2002-02-16 2002-10-15 Mechanical cone scarfing deburrer to remove oxygen cutting burrs and cutting beads after thermo-chemical cross-cutting or slitting steel workpieces such as slabs, blooms and billets Abandoned US20030154585A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP02003618A EP1336444B1 (de) 2002-02-16 2002-02-16 Mechanischer Kegel-Schälentbarter zum Entfernen von Sauerstoffschneidbärten und -schneidperlen nach dem thermochemischen Querteilen oder Längsteilen von stählernen Werkstücken wie Brammen, Blöcken und Knüppeln
EP02003618.2 2002-02-16

Publications (1)

Publication Number Publication Date
US20030154585A1 true US20030154585A1 (en) 2003-08-21

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Application Number Title Priority Date Filing Date
US10/271,127 Abandoned US20030154585A1 (en) 2002-02-16 2002-10-15 Mechanical cone scarfing deburrer to remove oxygen cutting burrs and cutting beads after thermo-chemical cross-cutting or slitting steel workpieces such as slabs, blooms and billets

Country Status (6)

Country Link
US (1) US20030154585A1 (de)
EP (1) EP1336444B1 (de)
JP (1) JP2005305554A (de)
AT (1) ATE363352T1 (de)
DE (1) DE50210232D1 (de)
ES (1) ES2220242T3 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7422399B1 (en) * 2006-09-13 2008-09-09 Rolland Edward Salsberry Debeading tool for butt-welded plastic pipe
US8708628B2 (en) 2010-11-23 2014-04-29 Centre De Recherche Industrielle Du Quebec Insertion component and method for inserting thereof through the surface of a workpiece
US9120188B2 (en) 2010-11-23 2015-09-01 Centre De Recherche Industrielle Du Quebec Apparatus and method for inserting a component through the surface of a workpiece
CN105834373A (zh) * 2016-04-28 2016-08-10 安徽霍山县象山机械制造有限公司 一种铸造砂芯去毛刺治具
CN111804966A (zh) * 2020-07-20 2020-10-23 江西荣仁电力器材有限公司 一种变压器撑条坡口刀具
CN113751799A (zh) * 2021-09-02 2021-12-07 上海江南长兴造船有限责任公司 一种t排倒棱机自动去渣去毛刺方法
CN115178872A (zh) * 2022-09-08 2022-10-14 浙江欧星环美汽车部件有限公司 用于轮辐与轮毂的焊接装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008013750U1 (de) * 2008-10-16 2010-03-04 Hans Weber Maschinenfabrik Gmbh Vorrichtung zum Abschlagen von Graten von flachen Werkstücken
JP5983266B2 (ja) * 2012-10-03 2016-08-31 Ｊｆｅスチール株式会社 連続鋳造スラブの端面溶着物除去方法
JP5892266B2 (ja) * 2013-09-04 2016-03-23 Ｊｆｅスチール株式会社 角状金属材の端部加工方法および装置

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
WO1982001676A1 (en) * 1980-11-11 1982-05-27 Kawasaki Steel Co Device for removing slag from melt-cut piece of steel
US4859126A (en) * 1986-02-21 1989-08-22 Keibler-Thompson Corp. Apparatus and method for removing dross ridges from a metal workpiece
EP0947264A3 (de) * 1997-04-21 1999-10-20 AUTE Gesellschaft für autogene Technik mbH Stahlstranggiessanlage mit Entbarter
ES2172483T3 (es) * 2000-07-15 2009-03-16 Aute Ag Gesellschaft Fur Autogene Technik Desbarbadora mecanica para la eliminacion de rebabas y grumos producidos por el oxigeno de corte tras el fraccionado termoquimico transversal o longitudinal de productos de acero como son planchones, lingotes opalanquillas.

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7422399B1 (en) * 2006-09-13 2008-09-09 Rolland Edward Salsberry Debeading tool for butt-welded plastic pipe
US20080292417A1 (en) * 2006-09-13 2008-11-27 Rolland Edward Salsberry Debeading tool for butt-welded plastic pipe
US8708628B2 (en) 2010-11-23 2014-04-29 Centre De Recherche Industrielle Du Quebec Insertion component and method for inserting thereof through the surface of a workpiece
US9120188B2 (en) 2010-11-23 2015-09-01 Centre De Recherche Industrielle Du Quebec Apparatus and method for inserting a component through the surface of a workpiece
US9259810B2 (en) 2010-11-23 2016-02-16 Centre De Recherche Industrielle Du Quebec Component to be inserted through the surface of a workpiece
US9381601B2 (en) 2010-11-23 2016-07-05 Centre De Recherche Industrielle Du Quebec Method for inserting a component through a surface of a workpiece
CN105834373A (zh) * 2016-04-28 2016-08-10 安徽霍山县象山机械制造有限公司 一种铸造砂芯去毛刺治具
CN111804966A (zh) * 2020-07-20 2020-10-23 江西荣仁电力器材有限公司 一种变压器撑条坡口刀具
CN113751799A (zh) * 2021-09-02 2021-12-07 上海江南长兴造船有限责任公司 一种t排倒棱机自动去渣去毛刺方法
CN115178872A (zh) * 2022-09-08 2022-10-14 浙江欧星环美汽车部件有限公司 用于轮辐与轮毂的焊接装置

Also Published As

Publication number Publication date
ES2220242T3 (es) 2007-12-01
DE50210232D1 (de) 2007-07-12
EP1336444B1 (de) 2007-05-30
ES2220242T1 (es) 2004-12-16
ATE363352T1 (de) 2007-06-15
JP2005305554A (ja) 2005-11-04
EP1336444A1 (de) 2003-08-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: GEGA CORP., PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LOTZ, HORST K.;REEL/FRAME:013393/0033

Effective date: 20020925

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION